gfx/harfbuzz/src/hb-ot-head-table.hh@925c144e1f1f (annotated)
gfx/harfbuzz/src/hb-ot-head-table.hh
Fri, 16 Jan 2015 18:13:44 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Fri, 16 Jan 2015 18:13:44 +0100
- branch
- TOR_BUG_9701
- changeset 14
- 925c144e1f1f
- permissions
- -rw-r--r--
Integrate suggestion from review to improve consistency with existing code.
| michael@0 | 1 | /* |
| michael@0 | 2 | * Copyright © 2010 Red Hat, Inc. |
| michael@0 | 3 | * Copyright © 2012 Google, Inc. |
| michael@0 | 4 | * |
| michael@0 | 5 | * This is part of HarfBuzz, a text shaping library. |
| michael@0 | 6 | * |
| michael@0 | 7 | * Permission is hereby granted, without written agreement and without |
| michael@0 | 8 | * license or royalty fees, to use, copy, modify, and distribute this |
| michael@0 | 9 | * software and its documentation for any purpose, provided that the |
| michael@0 | 10 | * above copyright notice and the following two paragraphs appear in |
| michael@0 | 11 | * all copies of this software. |
| michael@0 | 12 | * |
| michael@0 | 13 | * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR |
| michael@0 | 14 | * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES |
| michael@0 | 15 | * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN |
| michael@0 | 16 | * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH |
| michael@0 | 17 | * DAMAGE. |
| michael@0 | 18 | * |
| michael@0 | 19 | * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, |
| michael@0 | 20 | * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND |
| michael@0 | 21 | * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS |
| michael@0 | 22 | * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO |
| michael@0 | 23 | * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. |
| michael@0 | 24 | * |
| michael@0 | 25 | * Red Hat Author(s): Behdad Esfahbod |
| michael@0 | 26 | * Google Author(s): Behdad Esfahbod |
| michael@0 | 27 | */ |
| michael@0 | 28 | |
| michael@0 | 29 | #ifndef HB_OT_HEAD_TABLE_HH |
| michael@0 | 30 | #define HB_OT_HEAD_TABLE_HH |
| michael@0 | 31 | |
| michael@0 | 32 | #include "hb-open-type-private.hh" |
| michael@0 | 33 | |
| michael@0 | 34 | |
| michael@0 | 35 | namespace OT { |
| michael@0 | 36 | |
| michael@0 | 37 | |
| michael@0 | 38 | /* |
| michael@0 | 39 | * head -- Font Header |
| michael@0 | 40 | */ |
| michael@0 | 41 | |
| michael@0 | 42 | #define HB_OT_TAG_head HB_TAG('h','e','a','d') |
| michael@0 | 43 | |
| michael@0 | 44 | struct head |
| michael@0 | 45 | { |
| michael@0 | 46 | static const hb_tag_t tableTag = HB_OT_TAG_head; |
| michael@0 | 47 | |
| michael@0 | 48 | inline unsigned int get_upem (void) const { |
| michael@0 | 49 | unsigned int upem = unitsPerEm; |
| michael@0 | 50 | /* If no valid head table found, assume 1000, which matches typical Type1 usage. */ |
| michael@0 | 51 | return 16 <= upem && upem <= 16384 ? upem : 1000; |
| michael@0 | 52 | } |
| michael@0 | 53 | |
| michael@0 | 54 | inline bool sanitize (hb_sanitize_context_t *c) { |
| michael@0 | 55 | TRACE_SANITIZE (this); |
| michael@0 | 56 | return TRACE_RETURN (c->check_struct (this) && likely (version.major == 1)); |
| michael@0 | 57 | } |
| michael@0 | 58 | |
| michael@0 | 59 | protected: |
| michael@0 | 60 | FixedVersion version; /* Version of the head table--currently |
| michael@0 | 61 | * 0x00010000 for version 1.0. */ |
| michael@0 | 62 | FixedVersion fontRevision; /* Set by font manufacturer. */ |
| michael@0 | 63 | ULONG checkSumAdjustment; /* To compute: set it to 0, sum the |
| michael@0 | 64 | * entire font as ULONG, then store |
| michael@0 | 65 | * 0xB1B0AFBA - sum. */ |
| michael@0 | 66 | ULONG magicNumber; /* Set to 0x5F0F3CF5. */ |
| michael@0 | 67 | USHORT flags; /* Bit 0: Baseline for font at y=0; |
| michael@0 | 68 | * Bit 1: Left sidebearing point at x=0; |
| michael@0 | 69 | * Bit 2: Instructions may depend on point size; |
| michael@0 | 70 | * Bit 3: Force ppem to integer values for all |
| michael@0 | 71 | * internal scaler math; may use fractional |
| michael@0 | 72 | * ppem sizes if this bit is clear; |
| michael@0 | 73 | * Bit 4: Instructions may alter advance width |
| michael@0 | 74 | * (the advance widths might not scale linearly); |
| michael@0 | 75 | |
| michael@0 | 76 | * Bits 5-10: These should be set according to |
| michael@0 | 77 | * Apple's specification. However, they are not |
| michael@0 | 78 | * implemented in OpenType. |
| michael@0 | 79 | * Bit 5: This bit should be set in fonts that are |
| michael@0 | 80 | * intended to e laid out vertically, and in |
| michael@0 | 81 | * which the glyphs have been drawn such that an |
| michael@0 | 82 | * x-coordinate of 0 corresponds to the desired |
| michael@0 | 83 | * vertical baseline. |
| michael@0 | 84 | * Bit 6: This bit must be set to zero. |
| michael@0 | 85 | * Bit 7: This bit should be set if the font |
| michael@0 | 86 | * requires layout for correct linguistic |
| michael@0 | 87 | * rendering (e.g. Arabic fonts). |
| michael@0 | 88 | * Bit 8: This bit should be set for a GX font |
| michael@0 | 89 | * which has one or more metamorphosis effects |
| michael@0 | 90 | * designated as happening by default. |
| michael@0 | 91 | * Bit 9: This bit should be set if the font |
| michael@0 | 92 | * contains any strong right-to-left glyphs. |
| michael@0 | 93 | * Bit 10: This bit should be set if the font |
| michael@0 | 94 | * contains Indic-style rearrangement effects. |
| michael@0 | 95 | |
| michael@0 | 96 | * Bit 11: Font data is 'lossless,' as a result |
| michael@0 | 97 | * of having been compressed and decompressed |
| michael@0 | 98 | * with the Agfa MicroType Express engine. |
| michael@0 | 99 | * Bit 12: Font converted (produce compatible metrics) |
| michael@0 | 100 | * Bit 13: Font optimized for ClearType™. |
| michael@0 | 101 | * Note, fonts that rely on embedded bitmaps (EBDT) |
| michael@0 | 102 | * for rendering should not be considered optimized |
| michael@0 | 103 | * for ClearType, and therefore should keep this bit |
| michael@0 | 104 | * cleared. |
| michael@0 | 105 | * Bit 14: Last Resort font. If set, indicates that |
| michael@0 | 106 | * the glyphs encoded in the cmap subtables are simply |
| michael@0 | 107 | * generic symbolic representations of code point |
| michael@0 | 108 | * ranges and don’t truly represent support for those |
| michael@0 | 109 | * code points. If unset, indicates that the glyphs |
| michael@0 | 110 | * encoded in the cmap subtables represent proper |
| michael@0 | 111 | * support for those code points. |
| michael@0 | 112 | * Bit 15: Reserved, set to 0. */ |
| michael@0 | 113 | USHORT unitsPerEm; /* Valid range is from 16 to 16384. This value |
| michael@0 | 114 | * should be a power of 2 for fonts that have |
| michael@0 | 115 | * TrueType outlines. */ |
| michael@0 | 116 | LONGDATETIME created; /* Number of seconds since 12:00 midnight, |
| michael@0 | 117 | January 1, 1904. 64-bit integer */ |
| michael@0 | 118 | LONGDATETIME modified; /* Number of seconds since 12:00 midnight, |
| michael@0 | 119 | January 1, 1904. 64-bit integer */ |
| michael@0 | 120 | SHORT xMin; /* For all glyph bounding boxes. */ |
| michael@0 | 121 | SHORT yMin; /* For all glyph bounding boxes. */ |
| michael@0 | 122 | SHORT xMax; /* For all glyph bounding boxes. */ |
| michael@0 | 123 | SHORT yMax; /* For all glyph bounding boxes. */ |
| michael@0 | 124 | USHORT macStyle; /* Bit 0: Bold (if set to 1); |
| michael@0 | 125 | * Bit 1: Italic (if set to 1) |
| michael@0 | 126 | * Bit 2: Underline (if set to 1) |
| michael@0 | 127 | * Bit 3: Outline (if set to 1) |
| michael@0 | 128 | * Bit 4: Shadow (if set to 1) |
| michael@0 | 129 | * Bit 5: Condensed (if set to 1) |
| michael@0 | 130 | * Bit 6: Extended (if set to 1) |
| michael@0 | 131 | * Bits 7-15: Reserved (set to 0). */ |
| michael@0 | 132 | USHORT lowestRecPPEM; /* Smallest readable size in pixels. */ |
| michael@0 | 133 | SHORT fontDirectionHint; /* Deprecated (Set to 2). |
| michael@0 | 134 | * 0: Fully mixed directional glyphs; |
| michael@0 | 135 | * 1: Only strongly left to right; |
| michael@0 | 136 | * 2: Like 1 but also contains neutrals; |
| michael@0 | 137 | * -1: Only strongly right to left; |
| michael@0 | 138 | * -2: Like -1 but also contains neutrals. */ |
| michael@0 | 139 | SHORT indexToLocFormat; /* 0 for short offsets, 1 for long. */ |
| michael@0 | 140 | SHORT glyphDataFormat; /* 0 for current format. */ |
| michael@0 | 141 | public: |
| michael@0 | 142 | DEFINE_SIZE_STATIC (54); |
| michael@0 | 143 | }; |
| michael@0 | 144 | |
| michael@0 | 145 | |
| michael@0 | 146 | } /* namespace OT */ |
| michael@0 | 147 | |
| michael@0 | 148 | |
| michael@0 | 149 | #endif /* HB_OT_HEAD_TABLE_HH */ |
